Add a project domain

curl --request POST \
  --url {schemes}://api.upsun.com/projects/{projectId}/domains \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "attributes": {},
  "is_default": true
}
'

{
  "status": "<string>",
  "code": 123
}